Finite Element Refinement Analysis Of The Static Performance Of Tubular Truss Structure

Tubular truss structure has been the favor of architects for several years, thekey issue of tubular structures is the connection between different tubes. In tubulartruss structures, welded joints between circular hollow section is popular.Because of the joints’complicated geometry and stress state, joints’ failure isusually the fuse damage, then lead to buckling of connected tubes, until finally theentire structure failure occurs. Therefore, researches on tubular joints are essentialto explore the failure principle. Till now, the design and numerical research oftubular structures mostly based on beam model or pipe element home and abroad,which ignore the influence of joints’ rigidity and cannot track its failure; theexperimental studies mainly choosea single joint with proper constraints and loads,which will cause differences with its working in overall structure. In this paper, wechoose Shell181and Beam189element of ANSYS to modeland analyze plane andstereo tubular truss.The paper mainly contents the following four aspects:(1) The refined static performance of plane tubular truss, comparativelyanalyze results of different models with Shell element and beam element, then dofurther parametric analysis of three stiffened joint styles.This part summarized thevalidity of different joint stiffening styles(2) The refined static performance of stereo tubular truss, repeat the similarprogress of plane truss, and make contrast of different stiffened joint styles.(3) Analyze static performance of plane pipe truss in multi-scale model, withShell element in joints and beam element in tubes, the connection of differentelements is dealt with Multipoint Constraints (MPC) method. Based on the resultsand comparison of different model, the applicability ofmulti-scale model isconcluded.(4) Comparejoints’ carrying capacity of specificationshome and abroad withthe results of ANSYS, then conclude the diversity of numerical analysis andexperimental studies. The results revealed that the differences of joint workingindependently and in the structure will decrease joints carrying capacity.